I'm currently using just 1 Octa. The other lights are with standard reflectors and a diffusion cap. As you know the light modifiers by Elinchrom are expensive and I currently can't afford adding several bigger modifiers at once.

As for the placement of lights — at least for the sample wedding pictures the Octa is to the left of the camera, the other light (just a standard reflector) is to the right of the camera behind the subjects. Many other times the placement is different and depends on what the project calls for.